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| Keywords: RabinowJacob 003.jpg A simple demonstration in a NBS laboratory illustrating the properties of a magnetic fluid which is used in a new type of clutch A piece of nonmagnetic screening is inserted in the fluid which is a mixture of powdered iron and oil When the electromagnet of the model is energized the magnetic fluid forms chains of powdered iron grains along the flux lines between the two sides of the chamber These chains can be seen when the screen is forcibly withdrawn Jacob Rabinow invented the Magnetic Particle Clutch in 1947 during his work on ordnance at the National Bureau of Standards The particle clutch used a mixture of light lubricating oil and powdered carbonyl iron inside a chamber connecting two free spinning plates When an electromagnet attached to the chamber was energized the iron particles would magnetize and attract each other producing an almost solid mass which locked the plates together Controlling the magnetic flux would control the amount of torque between the plates Because Rabinow invented the Magnetic Particle Clutch as part of his work at the National Bureau of Standards the United States Government owned the U S patent However in partnership with his brother Joseph Rabinow did file for patents in 22 foreign countries Due of the simple design precise torque control smooth operation and long life the device found wide application It was used in Renault and Subaru automobiles in Europe and Japan in airplane controls and in the disc file of the IBM RAMAC computer Reference Inventing for Fun and Profit Jacob Rabinow San Francisco Press San Francisco CA 1990 pp 49-55 National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov Magnetic_particle_clutches | ||||
